The value to validate
true if the method is valid, false otherwise
// Valid methods
isValidHttpMethod('GET'); // true
isValidHttpMethod('POST'); // true
isValidHttpMethod('PUT'); // true
isValidHttpMethod('DELETE'); // true
isValidHttpMethod('PATCH'); // true
isValidHttpMethod('HEAD'); // true
isValidHttpMethod('OPTIONS'); // true
// Invalid methods
isValidHttpMethod('get'); // false (case sensitive)
isValidHttpMethod('GETS'); // false (typo)
isValidHttpMethod(''); // false (empty string)
isValidHttpMethod(null); // false (not a string)
isValidHttpMethod(123); // false (not a string)
isValidHttpMethod('TRACE'); // false (not supported)
// Usage in validation
function handleRequest(method) {
if (!isValidHttpMethod(method)) {
throw new Error(`Invalid HTTP method: ${method}`);
}
// method is now typed as HttpMethod
console.log(`Processing ${method} request`);
}
// Type guard usage
function processMethod(input) {
if (isValidHttpMethod(input)) {
// input is now typed as HttpMethod
return `Valid method: ${input}`;
} else {
// input is still unknown
return `Invalid method: ${input}`;
}
}
Validates whether a value is a supported HTTP method.
This function performs strict validation to ensure the input is exactly one of the supported HTTP methods. It's case-sensitive and requires exact string matches.
Validation Rules:
Type Guard: This function acts as a TypeScript type guard, narrowing the type from
unknowntoHttpMethodwhen it returnstrue.